For Percentage sign in the row go to the Properties of the chart => Number Tab = select the Expression => then under the Number Format setting click on the integer and then click on the show in Percentage. then Apply.

As said in earlier example you have to use a conditional statement as if so you can differentiate between the rows to identify when to use % and when not to.

then using num() function which gives you required formats.

One very important point to note here is that after using num function, you should make sure that under Number Tab you have chosen number format as Expression default, then only this num() function format will be picked.